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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 03, 2015
Dec. 28, 2013
Inventory Disclosure [Abstract]    
Work in progress $ 49,554us-gaap_InventoryWorkInProcessNetOfReserves $ 32,111us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 15,371us-gaap_InventoryFinishedGoodsNetOfReserves 14,111us-gaap_InventoryFinishedGoodsNetOfReserves
Total inventories $ 64,925us-gaap_InventoryNet $ 46,222us-gaap_InventoryNet